Operation Of The Line Connection Components Via An Isolating Transformer - Siemens SINAMICS S120 Equipment Manual

Line-side power components
2.2 Line connection variants
2.2.4

Operation of the Line Connection Components via an Isolating Transformer

The isolating transformer converts the type of the line supply type in the plant (e.g. IT/TT line
supply) to a TN line supply. Additional voltage adaptation to the permissible voltage
tolerance range is possible.
An isolating transformer must be used in the following cases:
• The insulation of the Power Module and/or the motor is not adequate for the voltages that
• There is no compatibility to an existing residual-current protective device.
• The installation altitude is greater than 2000 m above sea level.
• For all other systems that are not TN line supply systems with grounded neutral
Caution
If the line supply voltage is greater than 3-ph. 480 V AC +10% or 1-ph. 240 V AC +10%, it is
not permissible that an autotransformer is used.
In order to ensure protective separation, an isolating transformer must always be used.
2-6
occur.
conductor, a line filter should always be used.
Equipment Manual AC Drive
Manual, (GH6), 03/2006 Edition, 6SL3097-2AL00-0BP0